01 /*
02 * Java GPX Library (jpx-3.1.0).
03 * Copyright (c) 2016-2023 Franz Wilhelmstötter
04 *
05 * Licensed under the Apache License, Version 2.0 (the "License");
06 * you may not use this file except in compliance with the License.
07 * You may obtain a copy of the License at
08 *
09 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 * Author:
18 * Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
19 */
20 package io.jenetics.jpx.geom;
21
22 import static java.util.Objects.requireNonNull;
23
24 import io.jenetics.jpx.Length;
25 import io.jenetics.jpx.Length.Unit;
26 import io.jenetics.jpx.Point;
27
28 /**
29 * Helper class for collecting a stream of points to its length.
30 *
31 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
32 * @version 1.0
33 * @since 1.0
34 */
35 final class LengthCollector {
36
37 private final Geoid _geoid;
38 private final DoubleAdder _length = new DoubleAdder();
39
40 private Point _first;
41 private Point _start;
42
43 LengthCollector(final Geoid geoid) {
44 _geoid = requireNonNull(geoid);
45 }
46
47 LengthCollector combine(final LengthCollector other) {
48 throw new UnsupportedOperationException();
49 }
50
51 void add(final Point point) {
52 requireNonNull(point);
53
54 if (_first == null) {
55 _first = point;
56 }
57
58 final Point end = _start;
59 _start = point;
60
61 if (end != null) {
62 _length.add(_geoid.distance(end, _start).doubleValue());
63 }
64 }
65
66 Length pathLength() {
67 return Length.of(_length.doubleValue(), Unit.METER);
68 }
69
70 Length tourLength() {
71 if (_start != null && _first != null) {
72 _length.add(_geoid.distance(_start, _first).doubleValue());
73 }
74 return pathLength();
75 }
76 }
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